Multi-level single-component refrigeration natural gas liquefaction system and multi-level single-component refrigeration natural gas liquefaction method

A refrigeration system and natural gas technology, applied in refrigeration and liquefaction, liquefaction, solidification, etc., can solve the problem that the construction cost of large-scale liquefaction plants cannot be effectively controlled, and solve the bottleneck of localization, and the temperature difference in the heat exchange process is uniform and effective. Can lose little effect

Active Publication Date: 2012-07-04
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, due to the monopoly of foreign natural gas liquefaction technology and key equipment, the construction cost of large-scale liquefaction plants in my country cannot be effectively controlled

Method used

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  • Multi-level single-component refrigeration natural gas liquefaction system and multi-level single-component refrigeration natural gas liquefaction method
  • Multi-level single-component refrigeration natural gas liquefaction system and multi-level single-component refrigeration natural gas liquefaction method

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Embodiment Construction

[0027] A multi-stage single-component refrigeration natural gas liquefaction system, such as figure 1 As shown, including: propane compressor 1, ethylene compressor 2, methane compressor 3, high pressure propane evaporator 4, medium pressure propane evaporator 5, low pressure propane evaporator 6, high pressure ethylene evaporator 7, medium pressure ethylene evaporator 8. Low pressure ethylene evaporator 9, natural gas subcooler 10, propane cooler 11, ethylene cooler 12, methane cooler 13, propane storage tank 14, ethylene storage tank 15. in:

[0028] Propane compressor 1, propane cooler 11, propane storage tank 14, high-pressure propane evaporator 4, medium-pressure propane evaporator 5 and low-pressure propane evaporator 6 are connected in sequence to form a propane pre-cooling system for natural gas, methane and ethylene The agent is pre-cooled.

[0029] Ethylene storage tank 15, high-pressure ethylene evaporator 7, medium-pressure ethylene evaporator 8, low-pressure eth...

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Abstract

The invention discloses a multi-level single-component refrigeration natural gas liquefaction system and a multi-level single-component refrigeration natural gas liquefaction method. Purified natural gas is cooled gradually in six heat exchangers (evaporators) and a plate fin type heat exchanger (natural gas subcooler) until being liquefied. Cold energy required by the liquefying process is provided by a propane system, an ethylene system and a methane system. The system is rich in adjusting means, the cold energy matched with the natural gas liquefying process can be provided for the naturalgas liquefying process, and thereby operational flexibility and adaptability to raw materials of the method are embodied. The system and the method have the advantages that the natural gas liquefyingprocess is low in energy consumption; refrigerant compressors are all single-component compressors, so that design is easier, purchase is more convenient, the compressors are more stable in operation, domestic equipment can be used, and construction investment of liquefaction factories can be effectively reduced; and the liquefying process is wide in heat exchanger selection range, and a cold boxstructure and a tube-shell structure can be used simultaneously or alternatively.

Description

technical field [0001] The invention relates to a natural gas liquefaction process, in particular to a multi-stage single-component refrigeration natural gas liquefaction system and method. Background technique [0002] Liquefied natural gas (LNG) has clean and environmentally friendly properties, and it is rapidly promoted in many application fields such as urban gas, industrial fuel, urban gas peak regulation and accident emergency response, gas vehicles, and high-end porcelain processing in small and medium-sized towns without natural gas pipelines. However, due to the impact of international crude oil prices, the price of natural gas continues to rise, and the cost of raw materials for natural gas liquefaction plants continues to increase, resulting in a continuous decline in the profit margins of liquefaction plants. In recent years, natural gas liquefaction plants at home and abroad have developed towards large-scale and large-scale development. At present, the maximum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02F25J5/00
CPCF25J1/0022F25J1/0207F25J1/0082F25J1/0085F25J1/0087F25J1/0263F25J2250/02F25J1/0292F25J1/0052
Inventor 刘家洪龙增兵宋德琦汪宏伟郭成华孙林陆永康胡益武陈运强冼祥发蒲黎明宋光红琚宜林钟志良
Owner BC P INC CHINA NAT PETROLEUM CORP
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